<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul id="ul">
        <!-- <li>html</li>
        <li>css</li>
        <li>js</li> -->
    </ul>

    <!-- <script>
        let arr = ['html', 'css', 'js','node'];
        for (let i = 0; i < arr.length; i++) {
            // document.write('<li>' + arr[i] + '</li>');
            let li = document.createElement('li');
            li.innerHTML = arr[i];
            document.getElementById('ul').appendChild(li);
        }
    </script> -->

    <script>
        // 模板
        let template = `
            <ul>
                <% for(let i = 0; i < arr.length; i++) { %>
                    <li><%= arr[i] %></li>
                <% } %>
            </ul>
        `;

        function compile(tel){
            let  evalExpr = /<%=(.+?)%>/g;
            tel = tel.replace(evalExpr, '**');

            return tel;
        }

        console.log(compile(template));

    </script>
</body>
</html>